Github user rxin commented on a diff in the pull request: https://github.com/apache/spark/pull/16277#discussion_r92331760 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/trees/TreeNode.scala --- @@ -557,9 +562,10 @@ abstract class TreeNode[BaseType <: TreeNode[BaseType]] extends Product { } if (children.nonEmpty) { - children.init.foreach( - _.generateTreeString(depth + 1, lastChildren :+ false, builder, verbose, prefix)) - children.last.generateTreeString(depth + 1, lastChildren :+ true, builder, verbose, prefix) + children.init.foreach(_.generateTreeString( --- End diff -- i re-arranged this so it looks exactly the same as the way we traverse innerChildren to make it more obvious.
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